How much thought do you give to the use of leisure time, - to the minutes and hours given to recreation and sport ? Have you ever considered that this time, or a portion of it, could be made more useful and permanently profitable than you, perhaps, are now making it? The old adage, "All work and no play makes Jack a dull boy," is quite true; but, on the other hand, do we not too often give to pastime a greater portion of time than is advisable ? Would it not be better if we changed the character of our recreation to something more instructive, and yet quite as enjoyable, as continued play and sport?

Many of our readers will soon begin the "long vacation," when school cares and studies will be laid aside and almost forgotten. Undoubtedly many have already formed plans for some of the time, but others have not. To this latter class the importance of so doing is brought to their attention, if they desire to find themselves as all progressive boys should, better in mind and body when school work is again resumed. Some plan for developing useful recreation lies within the possibilities of everyone. Heedless is he who lets pass the opportunity for improving it.

It might be thought that a glacier would be the last place to search for microbes. According to a note presented to the Paris Academy of Sciences by Janssen, the celebrated French astronomer, however, M. Binot, chief of the Pasteur Institute laboratory, has lately been studying the Mont Blanc glaciers from the bacteriological standpoint by taking borings at different points, so as to bring up specimens of ice from various depths. An examination shows that in all layers of the glacial ice colonies of microbes of different species are present.

Prof. Charles Wilson has announced to the Royal Society a new determination of the temperature of the sun, which, with due allowance for slight unavoidable errors, is placed at 6,200 degrees Centigrade (11,192 Fahrenheit). If the probable absorption of the sun's radiated heat by its own atmosphere is allowed for, the mean temperature of the sun's body is placed at 6,600 degrees Centigrade. Professor Wilson started his calculations almost ten years ago.